21444003244 has 6 divisors (see below), whose sum is σ = 37527005684. Its totient is φ = 10722001620.

The previous prime is 21444003233. The next prime is 21444003247. The reversal of 21444003244 is 44230044412.

It is not an unprimeable number, because it can be changed into a prime (21444003247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2680500402 + ... + 2680500409.

Almost surely, 2^21444003244 is an apocalyptic number.

It is an amenable number.

21444003244 is a deficient number, since it is larger than the sum of its proper divisors (16083002440).

21444003244 is a wasteful number, since it uses less digits than its factorization.

21444003244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5361000815 (or 5361000813 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

Adding to 21444003244 its reverse (44230044412), we get a palindrome (65674047656).

The spelling of 21444003244 in words is "twenty-one billion, four hundred forty-four million, three thousand, two hundred forty-four".